Brachytx isodose intermed
CPT code 77317 covers intermediate-level treatment planning for brachytherapy, where radioactive sources are placed inside or near a tumor to deliver radiation. This involves calculating radiation dose distribution (isodose planning) for 1-4 sources or ribbon applications.
This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.
RVU breakdown
Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High
NCCI bundling edits
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Billing tips
Verify and document the exact number of sources/ribbons planned (1-4 for 77317) in the medical record and planning system printouts
Impact: Prevents downcoding to 77316 (simple, $158 less) or upcoding denials from 77318; accurate code selection ensures proper $316.67 reimbursement
Bill only once per brachytherapy course, not per fraction for HDR multi-fraction treatments using the same plan
Impact: Prevents duplicate billing denials; planning is reimbursed once unless plan is significantly modified requiring new isodose calculations
Include supporting documentation such as dose-volume histograms, isodose curves, and source loading documentation with initial claim submission
Impact: Reduces documentation requests and accelerates payment; decreases audit risk by 40-60% for radiation oncology services
Do not bill 77317 on same date as 77316 or 77318 for same treatment site without modifier 59 and clear documentation of separate, distinct planning sessions
Impact: Prevents automatic bundling denials; NCCI edits will reject dual planning codes without appropriate modifier and justification
For HDR brachytherapy, ensure planning code is billed before or on same date as first treatment delivery code (77761-77763)
Impact: Meets Medicare medical necessity timing requirements; delayed planning billing may trigger medical review and payment delays
Verify that medical physicist time and physician supervision are documented when both are involved in planning process
Impact: Supports the 9.79 total RVUs including work and practice expense components; critical for audit defense and compliance
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